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162 lines
3.7 KiB
162 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TWL6040 clock module driver for OMAP4 McPDM functional clock |
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* |
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* Copyright (C) 2012 Texas Instruments Inc. |
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* Peter Ujfalusi <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/twl6040.h> |
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#include <linux/clk-provider.h> |
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struct twl6040_pdmclk { |
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struct twl6040 *twl6040; |
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struct device *dev; |
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struct clk_hw pdmclk_hw; |
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int enabled; |
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}; |
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static int twl6040_pdmclk_is_prepared(struct clk_hw *hw) |
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{ |
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk, |
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pdmclk_hw); |
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return pdmclk->enabled; |
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} |
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static int twl6040_pdmclk_reset_one_clock(struct twl6040_pdmclk *pdmclk, |
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unsigned int reg) |
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{ |
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const u8 reset_mask = TWL6040_HPLLRST; /* Same for HPPLL and LPPLL */ |
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int ret; |
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ret = twl6040_set_bits(pdmclk->twl6040, reg, reset_mask); |
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if (ret < 0) |
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return ret; |
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ret = twl6040_clear_bits(pdmclk->twl6040, reg, reset_mask); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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/* |
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* TWL6040A2 Phoenix Audio IC erratum #6: "PDM Clock Generation Issue At |
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* Cold Temperature". This affects cold boot and deeper idle states it |
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* seems. The workaround consists of resetting HPPLL and LPPLL. |
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*/ |
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static int twl6040_pdmclk_quirk_reset_clocks(struct twl6040_pdmclk *pdmclk) |
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{ |
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int ret; |
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ret = twl6040_pdmclk_reset_one_clock(pdmclk, TWL6040_REG_HPPLLCTL); |
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if (ret) |
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return ret; |
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ret = twl6040_pdmclk_reset_one_clock(pdmclk, TWL6040_REG_LPPLLCTL); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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static int twl6040_pdmclk_prepare(struct clk_hw *hw) |
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{ |
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk, |
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pdmclk_hw); |
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int ret; |
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ret = twl6040_power(pdmclk->twl6040, 1); |
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if (ret) |
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return ret; |
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ret = twl6040_pdmclk_quirk_reset_clocks(pdmclk); |
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if (ret) |
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goto out_err; |
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pdmclk->enabled = 1; |
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return 0; |
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out_err: |
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dev_err(pdmclk->dev, "%s: error %i\n", __func__, ret); |
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twl6040_power(pdmclk->twl6040, 0); |
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return ret; |
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} |
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static void twl6040_pdmclk_unprepare(struct clk_hw *hw) |
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{ |
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk, |
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pdmclk_hw); |
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int ret; |
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ret = twl6040_power(pdmclk->twl6040, 0); |
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if (!ret) |
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pdmclk->enabled = 0; |
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} |
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static unsigned long twl6040_pdmclk_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk, |
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pdmclk_hw); |
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return twl6040_get_sysclk(pdmclk->twl6040); |
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} |
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static const struct clk_ops twl6040_pdmclk_ops = { |
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.is_prepared = twl6040_pdmclk_is_prepared, |
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.prepare = twl6040_pdmclk_prepare, |
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.unprepare = twl6040_pdmclk_unprepare, |
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.recalc_rate = twl6040_pdmclk_recalc_rate, |
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}; |
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static const struct clk_init_data twl6040_pdmclk_init = { |
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.name = "pdmclk", |
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.ops = &twl6040_pdmclk_ops, |
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.flags = CLK_GET_RATE_NOCACHE, |
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}; |
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static int twl6040_pdmclk_probe(struct platform_device *pdev) |
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{ |
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struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent); |
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struct twl6040_pdmclk *clkdata; |
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int ret; |
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clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL); |
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if (!clkdata) |
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return -ENOMEM; |
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clkdata->dev = &pdev->dev; |
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clkdata->twl6040 = twl6040; |
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clkdata->pdmclk_hw.init = &twl6040_pdmclk_init; |
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ret = devm_clk_hw_register(&pdev->dev, &clkdata->pdmclk_hw); |
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if (ret) |
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return ret; |
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platform_set_drvdata(pdev, clkdata); |
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return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_simple_get, |
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&clkdata->pdmclk_hw); |
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} |
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static struct platform_driver twl6040_pdmclk_driver = { |
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.driver = { |
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.name = "twl6040-pdmclk", |
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}, |
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.probe = twl6040_pdmclk_probe, |
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}; |
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module_platform_driver(twl6040_pdmclk_driver); |
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MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock"); |
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MODULE_AUTHOR("Peter Ujfalusi <[email protected]>"); |
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MODULE_ALIAS("platform:twl6040-pdmclk"); |
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MODULE_LICENSE("GPL");
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